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Method for preparing laminar assembled self-supporting membrane by using ion lift-off technology

A layered assembly and self-supporting technology, applied in coatings, devices for coating liquids on the surface, etc., can solve the problems that large-area self-supporting films cannot be prepared and are difficult to be widely used

Inactive Publication Date: 2007-12-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to be widely used, and it has high requirements on the thickness and mechanical properties of the film.
Frank Mallwitz and André Laschewsky applied the network support commonly used to prepare single-layer self-supporting films to the preparation of self-supporting polymer multilayer films, but this method cannot prepare large-area self-supporting films

Method used

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  • Method for preparing laminar assembled self-supporting membrane by using ion lift-off technology
  • Method for preparing laminar assembled self-supporting membrane by using ion lift-off technology
  • Method for preparing laminar assembled self-supporting membrane by using ion lift-off technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: utilize Cu 2+ Preparation of polyacrylic acid (PAA) / polyacrylamine (PAH) layered self-supporting membrane

[0032] The selected solid substrate—the processing method of silicon (glass or quartz) substrate is as follows: successively use toluene, acetone, chloroform, ethanol and distilled water to treat ultrasonically for 10 minutes respectively, to remove various impurities attached to the surface of the substrate, and then in 98% H 2 SO 4 and 30%H 2 o 2 (v:v=7:3) in a mixed solution and heated to boil (~20min) until no bubbles overflowed. After cooling, rinse with a large amount of distilled water, then blow dry with nitrogen, and set aside, the surface of the treated silicon substrate contains a large amount of silanol; soak the treated silicon substrate in 1mg / mL polydiallyldimethylammonium hydrochloride Salt (PDDA) for 30min, the surface is modified by self-assembly with a layer of positively charged quaternized amino groups, and the modified subst...

Embodiment 2

[0039] Embodiment 2: utilize Fe 3+ Preparation of polyacrylic acid (PAA) / polyacrylamine (PAH) layered self-supporting membrane

[0040] The treatment of the substrate and the preparation of the PAA / PAH layered assembled polymer multilayer film are the same as the above example. Preparation method of PAA / PAH self-supporting membrane: stripping solution is 0.1mol / L FeCl 3 Aqueous solution, stripping ionic Fe 3+ It can also coordinate with the carboxyl group in PAA, which destroys the interaction between PAA and PDDA, and promotes the separation of the film from the substrate; at the same time, Fe 3+ Coordination with the carboxyl and amine groups in the film stabilizes the film, thereby allowing Fe 3+ Exfoliation of the layered assembled film yielded a self-supported layered assembled polymer multilayer film, and the self-supported polymer film exhibited the yellow color of ferric ions.

Embodiment 3

[0041] Example 3: Using H + Preparation of polyacrylic acid (PAA) / polyacrylamine (PAH) layered self-supporting membrane

[0042] Similarly, treat the substrate in the same way to prepare a PAA / PAH layered assembly polymer multilayer film, and prepare a cross-linked and stable PAA / PAH on the substrate by heat treatment (130-200°C, 0.5-3h). Layer-by-layer assembly of polymer multilayer films.

[0043] The preparation method of PAA / PAH self-supporting film: the (PAA / PAH) * 15 The layered assembled polymer multilayer film is soaked in the hydrochloric acid aqueous solution of pH = 2 for 3 minutes, and the PAA / PAH layered assembled self-supporting film can also be prepared. The preparation mechanism is: stripping the ion H + The protonation of PAA also achieves the effect of destroying the interaction between PAA and PDDA; at the same time, since the film has been stabilized by thermal crosslinking before the introduction of stripping ions, the stripping ion H + This covalently ...

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Abstract

The invention belongs to the multilayered thin film preparation field; it concretely involves a method that uses the ion peel-off technology to prepare large area layered assembly self-support membrane, including basis processing, layered-assembly membrane preparation, configuration of the peeling solution, preparation layered assembly self-support membrane using ion peel-off technology. The invention is not limited by the basis size, the shape, the type, and always holds true in the plane, the bended surface and the anomalous surface's, it can make the self-support membrane which are tubular or more complex form. This has a vital significance: On one hand, self-support membrane helps to research the layered assembly film's performance expediently, opens out the inner contact between the layered assembly film's performance, the chemical composition of the film and microscopic structure. On the other hand, compared with the layered assembly film which adheres to the solid fundus, self-support membrane will expand the application of the layered assembly film, including separating the membrane, the sensor, the catalyzed function thin film, the micro mechanism, even the man-made apparatus.

Description

technical field [0001] The invention belongs to the field of multilayer film preparation, and in particular relates to a method for preparing a large-area layered self-supporting film by using ion stripping technology. Background technique [0002] As an effective method for the controllable construction of multilayer films, layered assembly technology has attracted more and more attention. The preparation process of the layered assembly film is simple, does not require complicated equipment, and the film-forming material is abundant. The film preparation is not limited by the size, shape and type of the substrate, and the thickness of the single-layer film is in the range of several angstroms to several nanometers. It is easy to regulate. In the past ten years, the construction technology of layered membranes has been greatly developed, mainly including the following aspects: (1) A series of construction technologies of layered membranes have been developed, modified and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/18B05D1/38C08J5/18
Inventor 孙俊奇马莹
Owner JILIN UNIV
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